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This article presents a model of phosphorus removal in a new sewage treatment system, consisting of anaerobic treatment in a UASB reactor and post-treatment in polishing ponds operated in a sequential batch regime (LPBS). The processes that take place in the LPBS cause a pH increase, which in turn leads to the removal of nutrients by phosphate precipitation in the presence of calcium ions. It was possible to obtain very low concentrations of phosphorus (<1mgP.L) when the pH in the pond reached values above 9.5. It was established that phosphorus precipitated in the lagoons in the form of calcium hydroxyapatite C10(OH)2(PO4)6. Thus, the feasibility of removing phosphorus in the UASB-LPBS system was demonstrated, without the need for inputs of materials or energy, except for solar energy.

Remoção de fósforo em lagoas de polimento operadas em regime de bateladas sequenciais